P0112 Pontiac Code - Intake Air Temperature Sensor Circuit Low Voltage
Quick Answer
The Intake Air Temperature (IAT) sensor contains a semiconductor device which changes the resistance based on the temperature (a thermistor). Common causes include Dirty air filter, Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0112 Pontiac indicates Intake Air Temperature Sensor Circuit Low Voltage.
- Common causes
- Common causes include Dirty air filter, Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0112 Pontiac Description
When the intake air is cold, the sensor (thermistor) resistance is high. The PCMs signal voltage is only pulled down a small amount through the sensor to a ground; therefore, the PCM senses a high signal voltage (low temperature). When the intake air is warm, the sensor resistance is low. The signal voltage is pulled down a greater amount; therefore, the PCM senses a low signal voltage (high temperature).
When the PCM senses a signal voltage lower than the normal operating range of the sensor, this Diagnostic Trouble Code (DTC) sets.
What are the Possible Causes of the DTC P0112 Pontiac?
- Dirty air filter
- Faulty Intake Air Temperature (IAT) Sensor
- Intake Air Temperature Sensor harness is open or shorted
- Intake Air Temperature Sensor circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P0112 Pontiac?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0112 Pontiac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0112 Pontiac Code
What does the OBDII code P0112 mean for a Pontiac?
P0112 indicates that the intake air temperature (IAT) sensor is reporting a voltage that is too low, likely due to a fault in the sensor or its circuit.
What are common symptoms of code P0112?
Symptoms may include poor engine performance, rough idling, reduced fuel efficiency, and the check engine light being illuminated.
What causes P0112 to trigger on a Pontiac?
Possible causes include a faulty IAT sensor, damaged wiring or connectors, shorted circuits, or an issue with the engine control module (ECM).
Can I drive my Pontiac with code P0112?
While the vehicle may still be drivable, ignoring the code can lead to engine performance issues and increased fuel consumption. It’s best to address the problem promptly.
How do I diagnose code P0112?
Use an OBDII scanner to confirm the code, and then inspect the IAT sensor, wiring, and connectors for damage or corrosion. Test the sensor’s voltage with a multimeter.
How can I fix code P0112 on my Pontiac?
Repairs may include replacing the IAT sensor, repairing or replacing damaged wiring or connectors, or updating/reprogramming the ECM if necessary.
Where is the intake air temperature sensor located on a Pontiac?
The IAT sensor is typically located near the air intake system, often within or close to the air filter housing.
Can a dirty air filter cause code P0112?
A dirty air filter is unlikely to directly cause P0112, but it can affect airflow and engine performance, contributing to related issues.
How much does it cost to repair code P0112?
Repair costs vary but typically range from $100 to $250 for parts and labor, depending on the severity of the issue and the specific Pontiac model.
Is it necessary to reset the ECM after fixing P0112?
Yes, after repairs, it’s recommended to clear the code with an OBDII scanner to reset the ECM and verify the problem has been fixed.
Discuss the causes and fixes for P0112 Pontiac OBDII Code
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